All of that is built into the margin of error and effectively minimized through scientific polling methods (i.e., polling 600 instead of 60).
Hang ups are overcome through proper model construction based on known voter registration statistics.
You can look at it as being similar to the effective elimination of stock-specific risk through the creation of a diversified portfolio.
We can’t believe any polls during an election. No one has any integrity to trust anymore. It’s all professional propaganda gaming.